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Definition of through in English:

preposition& adverb

1Moving in one side and out of the other side of (an opening, channel, or location): [as preposition]:steppingboldly through the doorway [as adverb]:as soon as we opened the gate, they came streaming through

2.2From beginning to end of (an experience or activity, typically a tedious or stressful one): [as preposition]:we sat through some very boring speechesshe’s been through a bad time [as adverb]:Karl will see you through, Ingrid

Old English thuruh was an alteration of thurh ‘through’, and the two forms were both originally used for through. The adjective ‘carried out in every detail’ dates from the late 15th century, a period when it also meant ‘going or extending through something’ surviving in late Middle English thoroughfare (literally ‘a track going through’), and familiar from Shakespeare's ‘Over hill, over dale, Thorough bush, thorough briar’ in A Midsummer Night's Dream.